I. Szpektor, and I. Dagan. COLING '08: Proceedings of the 22nd International Conference on Computational Linguistics, page 849--856. Morristown, NJ, USA, Association for Computational Linguistics, (2008)
X. Phan, L. Nguyen, and S. Horiguchi. WWW '08: Proceeding of the 17th international conference on World Wide Web, page 91--100. New York, NY, USA, ACM, (2008)